摘要
为明确钢管混凝土柱的抗爆特性,采用显式动力有限元分析软件ANSYS/LS-DYNA,基于多物质流固耦合法,建立了构件、空气和炸药的数值模型,对钢管混凝土柱在爆炸荷载下的动力响应和破坏形态进行了模拟分析。结果表明:爆炸荷载下钢管混凝土柱的破坏类型与作用其上的超压峰值及正压作用时间直接相关,三种典型破坏形态分别是,低超压峰值-高持时爆炸荷载作用下,发生弯曲破坏;高超压峰值-低持时爆炸荷载作用下,发生剪切破坏;二者之间,发生弯剪破坏;对比方形截面,圆形截面柱具有更强的抵御爆炸荷载的能力;核心混凝土强度等级的增强以及含钢率的提高,可有效降低柱中点水平残余变形;提高钢管屈服强度,可降低柱中残余变形,当钢材强度等级≥345 MPa时,继续增大屈服强度对提高钢管混凝土柱的抗爆性能意义不大。
In order to study the dynamic response and destruction pattern of concrete filled steel tube under blast load,the explicit dynamic finite element software ANSYS/LS-DYNA was used to establish the finite element model of concrete filled steel tube with component,air and explosive. And the method of multiple substances fluid solid coupling was applied to the simulation. The results of numerical simulation show that the failure type of concrete filled steel tube under blast load depends on peak overpressure and positive pressure duration. Three typical destruction paradigm can be categorized into flexural damage under low peak overpressure-long duration blast loading,shear fracture under high peak overpressure-short duration blast loading and bending-shear failure between the above two cases. Compared with square section,the circular cross section columns have better resisting blast capability. Enhancing the core concrete＇s strength grade and enlarging the steel ratio can effectually bring down the residual deformation. Heightening the yield strength can reduce the residual deformation limitedly,which have little significance when the yield strength is greater than or equal to 345 MPa.
作者
孙珊珊
赵均海
付国
SUN Shanshan1, ZHAO Junhai1, FU Guo2(1. School of Civil Engineering, Chang＇ an University, Xi＇ an, Shaanxi 710061, China ; 2. College of Water Resources ＆ Architectural Engineering, Northwest A＆F University, Yangling, Shaanxi 712100, Chin)
出处
《水利与建筑工程学报》
2018年第3期149-154,共6页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金项目(51708035)
高等学校博士学科点专项科研基金项目(20110205130001)
中央高校基本科研业务费专项资金资助项目(310828173402
310828171012
310828171003)
关键词
钢管混凝土
爆炸荷载
动态响应
流固耦合
数值模拟
concrete filled steel tube
blast load
dynamic response
fluid-solid coupling
numerical simulation
